What type of air brake test is required when picking up cars that have been in storage for 2 months?

The correct choice is the Class 1 Air Brake Test, which is necessary when picking up cars that have been out of service, such as those in storage for two months. This test ensures that all of the air brake components are functioning properly and that the system is ready for safe operation.

A Class 1 Air Brake Test requires a thorough inspection, including checking for leaks in the brake pipes, inspecting brake equipment, and ensuring that the brakes can be applied and released correctly. This level of testing is critical after a long period of inactivity, as components may become damaged, corroded, or otherwise non-operational while in storage.

In contrast, a Class 2 Air Brake Test is less comprehensive and typically applies to cars that have just been out of service for a short period, while a Class 3 test is usually performed on cars that have been in service and require only a quick check. Lastly, not requiring any air brake test would not ensure the safety of the system after a significant lapse in operational status. Therefore, a Class 1 test is the appropriate and necessary action in this scenario to guarantee the safety and reliability of the air brake system.